A
angelwinte_july


BT1: chung minh bieu thuc sau khong phu thuoc vao bien:
$A= \dfrac{x-y}{xy} + \dfrac{y-z}{yz}+ \dfrac{z-x}{zx}$
BT2:
a, Tinh $\dfrac{1}{n} - \dfrac{1}{n+1}$
b, Ap dung tinh tong
$A=\dfrac{1}{x(x+1)}+\dfrac{1}{(x+1)(x+2)}+\dfrac{1}{(x+2)(x+3)}+\dfrac{1}{x+4}$
Bt3: Cho
$3a^2 +3b^2 = 10ab$ $( b>a>o )$
Tinh GTBT
$P= \dfrac{a-b}{a+b}$
$A= \dfrac{x-y}{xy} + \dfrac{y-z}{yz}+ \dfrac{z-x}{zx}$
BT2:
a, Tinh $\dfrac{1}{n} - \dfrac{1}{n+1}$
b, Ap dung tinh tong
$A=\dfrac{1}{x(x+1)}+\dfrac{1}{(x+1)(x+2)}+\dfrac{1}{(x+2)(x+3)}+\dfrac{1}{x+4}$
Bt3: Cho
$3a^2 +3b^2 = 10ab$ $( b>a>o )$
Tinh GTBT
$P= \dfrac{a-b}{a+b}$
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